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EV-Series Indoor
ERV
6.0 OPERATION
6.1 PRINCIPLE OF OPERATION
The EV450IN has one basic purpose: to exhaust air from a structure and bring in fresh air from
outside, while transferring heating or cooling energy from the exhaust air to the fresh air.
The EV450IN is a very simple device, and will accomplish this purpose as long as the blower is
able to move air through the enthalpic core.
6.2 PRE-START-UP
6.2.1 Verify Voltages
Using a voltmeter, test the input voltages as supplied to the disconnect switch. Refer to Digit 13
of the unit Configuration Code to find the rated voltage. The supplied voltage must be /-
10% of the rated voltage.
6.2.2 Verify Transformer Wiring
Units with 230 VAC power source are shipped with the transformer wired for 208 VAC. If the
unit is receiving 230 VAC, make sure the black primary-side wire on the transformer’s 208 V
terminal has been moved to the 230 V terminal.
6.2.3 Inspect Filters
Clean filters must be installed prior to fan start-up.
6.2.4 Inspect Foam Gasketing
Inspect the gasketing to make sure there are no gaps allowing air movement around the cores
or filters.
6.2.5 Inspect Fans
Prior to start-up, the fans should be rotated by hand to make sure that the impeller is not
rubbing anywhere and that they turn freely.
6.2.6 Inspect and Clean the Cabinet Interior
During the construction and installation phases of a project, dust, dirt and debris will often
accumulate inside a unit. Thoroughly clean the inside of the unit by vacuuming and/or wiping
metal surfaces with a damp rag.
6.2.7 Inspect Ductwork Connections
Ducts attached to the ERV must be firmly attached, sealed and supported in accordance with
installation instructions and SMACNA guidelines.
5.6 QUICK-START FOR TESTING CORRECT 3PH WIRING
All units that run on 3 phase power should be test-run immediately after high voltage wiring
connections are made. This will verify that the three phases are properly connected, that the
dampers will open and close properly and the fans are working properly.
For purposes of testing correct phase connections, the internal 24 VAC power supply will be
used to power-up the fans and all external control devices will be disabled, when applicable.
NOTE: Any changes
to unit low-voltage
wiring should be
made with the disconnect
switch in the OFF position.
OPERATION
